<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      * {
        margin: 0;
        padding: 0;
      }
      .parent {
        width: 500px;
        height: 500px;
        background-color: pink;
        left: 100px;
        top: 100px;
        position: absolute;
      }
      .child {
        width: 300px;
        height: 200px;
        background-color: blue;
      }
      .box {
        width: 100px;
        height: 100px;
        background-color: green;
        left: 20px;
      }
    </style>
  </head>
  <body>
    <div class="parent">
      <div class="child"></div>
    </div>
    <div class="box">hello,world</div>
    <script>
      const oParent = document.querySelector(".parent");
      setTimeout(() => {
        oParent.style.position = "static";
      }, 5000);
    </script>
  </body>
</html>
